High-Frequency Modeling and Analysis of Single-Layer NiZn Ferrite Inductors for EMI Filtering in Power Electronics Applications

Yang Li, Zhaohui Zhang, Jinyun Yu, Zhiqiang Liu and Qiao Li ()
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Yang Li: EHV Transmission Companies Dali Office of China Southern Power Grid Co., Ltd., Dali 671000, China
Zhaohui Zhang: EHV Transmission Company of China Southern Power Grid Co., Ltd., Guangzhou 510530, China
Jinyun Yu: EHV Transmission Companies Dali Office of China Southern Power Grid Co., Ltd., Dali 671000, China
Zhiqiang Liu: EHV Transmission Companies Dali Office of China Southern Power Grid Co., Ltd., Dali 671000, China
Qiao Li: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China

Energies, 2024, vol. 17, issue 22, 1-17

Abstract: In the high-frequency (HF) region, specifically within the 150 kHz to 30 MHz range for conducting electromagnetic interference (EMI) modeling, NiZn inductors exhibit enhanced efficiency due to their low core losses and stable permeability. Consequently, the accurate modeling of NiZn ferrite toroidal inductors is essential, given their widespread applications in the HF domain, with the aim of addressing existing knowledge gaps. Previous inductor models often relied on the perfect electric conductor (PEC) assumption, which simplifies the analysis but does not fully represent the electromagnetic behavior of the cores to which the PEC assumption cannot be applied. This study investigates the actual electromagnetic behavior of NiZn cores, treating them as dielectrics, which diverges from the traditional PEC-based models. Furthermore, this research fully considers the actual geometry of the inductors, proposing a comprehensive and precise analytical model for NiZn ferrite toroidal inductors. The impact of various winding methods on core capacitance is also explored. The paper provides a detailed explanation of the physical significance underlying the proposed model. A comparative analysis of both modeling methods is presented, and the efficacy of the suggested approach is validated through simulations and experimental results in several distinct scenarios.

Keywords: NiZn toroidal inductors; circuit model; electromagnetic analysis; winding methods (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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